Hi, I installed a msi radeon 7850 into an hp pavillion p7-1210. It isn't recognized by the computer and seems to have no power. The Bios has no option to turn on /off the onboard video and the control panel search does not show a new video card. Are there dip settings to turn on the card slot or somewhere else in the control panel or device settings?
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Those HP 300w power supplies are not powerful enough for that card. You'll need to upgrade it, that is all....
You might get a 7750 to work with that power supply. Can you trade your 7850 for one of those?